Characterization of Fe- and Mn-doped GDC for low-temperature processing of solid oxide fuel cells

Effect of transition metal oxides doping on Ce0.9Sm0.05Nd0.05O1.95 solid electrolyte materials

“…It is inferred that the TMOs doping has a significant effect on the densification process of SNDC, the rapid densification of TMO-added samples may be attributed to a liquid-phase sintering mechanism: the presence of a liquid formed by the TMOs leaded to an increased area of contract among the particles during the sintering process. This in turn promoted the mass diffusivity and consequently the sinterability, as indicated by previous studies [2,16,17]. Figure 3 shows the XRD patterns of TMO-doped SNDC sintered at 1450 ℃ for 2 h. The undoped SNDC sintered at 1600 ℃ for 5 h is also shown for comparison.…”

Strengthening of Gadolinia‐Doped Ceria (Ce0.80Gd0.20O2‐δ) Thick Ceramic Membranes with Co‐Doping of 1 mol% CuO

“…Both CGCO‐1100 and CGO‐1400 exhibits a pure cubic fluorite structure (PDF#75‐0163), indicating that fine fluorite structure of CeO 2 can be obtained at much lower temperature after a minor amount of CuO doping. It is noticed that no reflection associated with Cu oxides was observed in CGCO, which can be attributed to that the oxides of Cu is presented at concentrations below the XRD detection limit …”

“…Among the ceria‐based materials, 20 mol% gadolinium‐doped ceria (Ce 0.80 Gd 0.2 O 2‐δ , CGO) has very high ionic conductivities at all doping levels . One problem for CGO electrolyte is that full densification requires sintering temperature exceeding 1300°C, which will lead to high fabrication cost, reduction of Ce 4+ to Ce 3+ and failure of co‐firing with electrodes during fabrication of cathode supported CMFCs . Another problem is that reliable mechanical properties of the electrolyte is necessary for the design of optimum structure for SOFCs and prediction of the service lifetimes .…”

“…8 One problem for CGO electrolyte is that full densification requires sintering temperature exceeding 1300°C, which will lead to high fabrication cost, reduction of Ce 4+ to Ce 3+ and failure of co-firing with electrodes during fabrication of cathode supported CMFCs. 9 Another problem is that reliable mechanical properties of the electrolyte is necessary for the design of optimum structure for SOFCs and *ycdong@iue.ac.cn, dongyc9@mail.ustc.edu.cn © 2014 The American Ceramic Society prediction of the service lifetimes. 10 However, due to thermo-mechanical stresses generated as a consequence of a comprehensive effect between low strength and expansion mismatch between electrolyte and electrodes during cell fabrication and operation, CGO electrolytes always exhibit poor mechanical performances, which no doubt has limited its practical application.…”

Effect of MnO2 Concentration on the Conductivity of Ce0.9Gd0.1MnxO2−δ

“…Mainly Gd 2 O 3 [7,10,11], but in some cases also other oxides [1], were used as main dopants to fix the oxygen vacancy concentration of the material. The solubility limit of Mn in pure ceria has been found to be in the range between 5-10 mol % [7,8,12], or <1 mol % in another study [13].…”